Sequential diagnosis system used for nanosecond and picosecond laser beam combined targeting

Abstract

The invention discloses a sequential diagnosis system used for nanosecond and picosecond laser beam combined targeting, and is used for sequential precision diagnosis in combined targeting by using nanosecond laser beams and picosecond laser beams simultaneously in a laser plasma experiment. The sequential diagnosis system comprises an imaging slit plate, a hard X-ray shielding body, a photocathode slit plate, a photocathode and a streak camera which are arranged in turn along a horizontal direction. In the experiment, soft X-rays generated by nanosecond laser beam targeting are imaged through the slit plate and then irradiated to the partial area of the photocathode; and hard X-rays generated by picosecond laser beam targeting directly penetrate through the slit plate (without imaging) and then irradiate all the area of the photocathode. Two types of X-rays of which the original light source positions are overlapped can be spatially separated on the images recorded by the streak camera so that diagnosis of the sequential relationship between the nanosecond laser beams and the picosecond laser beams can be realized. The sequential diagnosis system has ten picosecond level time discrimination and also has certain soft X-ray spatial discrimination so as to have wide application prospect.

Description

technical field [0001] The invention belongs to the field of laser fusion research and the field of X-ray detection, and in particular relates to a timing diagnosis system for joint targeting of nanosecond and picosecond laser beams. Background technique [0002] With the rapid development of ultra-short pulse laser technology, more and more laser beams with multiple power densities are used for joint targeting in laser experimental research: such as nanosecond laser beams and picosecond laser beams for joint target physical research . A typical application is in the research of fast ignition physics. It is necessary to use the nanosecond laser beam to compress the CD target pellet at the same time, and at the same time use the picosecond laser beam to generate the superthermal electron beam to heat the compressed plasma or generate X-rays. Density diagnosis. These experimental studies urgently need to ensure that the picosecond laser beam is injected into the target point...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings of the lack of accuracy in timing diagnosis of combined nanosecond and picosecond laser beams in the prior art

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